package com.sali.commons.result;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.sali.commons.exception.ErrorHandlerResult;
import com.sali.utils.result.R;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/**
 * @description: 统一结果返回兜底
 * @author: sali
 * @date: 2024/7/20 16:14.
 * @version: 1.0
 */
@RestControllerAdvice
public class GlobalResultHandler implements ResponseBodyAdvice<Object> {

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if (body instanceof ErrorHandlerResult errorHandler){
            return R.fail(errorHandler.getCode(), errorHandler.getMsg());
        }else if(body instanceof  String){
            try {
                return new ObjectMapper().writeValueAsString(R.success(body));
            }catch (Exception ex){
                ex.printStackTrace();
            }
        }else if (body instanceof R){
            return body;
        }
        return R.success(body);
    }
}
